Thermogravimetric and model-free kinetic studies on CO2 gasification of low-quality, high-sulphur Indian coals

Journal of Earth system science

Rahul Choudhury1¹  Tonkeswar Das1¹  Banashree Mahanta1¹  Ananya Saikia1¹  Binoy K Saikia1¹ 

[1] Polymer Petroleum and Coal Chemistry Group, Materials Science & Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, Assam, India$$

关键词: Low-quality coal;    Indian coal;    CO2-gasification;    thermogravimetric analysis;    model-free kinetics;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Coal gasification with CO$_2$ has emerged as a cleaner and more efficient way for the production of energy, and it offers the advantages of CO$_2$ mitigation policies through simultaneous CO$_2$ sequestration. In the present investigation, a feasibility study on the gasification of three low-quality, high-sulphur coals fromthe north-eastern region (NER) of India in a CO$_2$ atmosphere using thermogravimetric analysis (TGADTA) has been made in order to have a better understanding of the physical and chemical characteristics in the process of gasification of coal. Model-free kinetics was applied to determine the activation energies (E) and pre-exponential factors (A) of the CO$_2$ gasification process of the coals. Multivariate nonlinear regression analyses were performed to find out the formal mechanisms, kinetic model, and the corresponding kinetic triplets. The results revealed that coal gasification with CO$_2$ mainly occurs in the temperature range of 800◦–1400◦C and a maximum of at around 1100◦C. The reaction mechanisms responsible for CO$_2$ gasification of the coals were observed to be of the ‘nth order with autocatalysis (CnB)’ and ‘nth order (Fn) mechanism’. The activation energy of the CO$_2$ gasification was found to be in the range 129.07–146.81 kJ mol$^{−1}$.

【 授权许可】

Unknown